Visualization of weak confinement potentials by near-field optical imaging spectroscopy of exciton and biexciton in a single quantum dot

Y. Sugimoto, T. Saiki, S. Nomura

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Imaging spectroscopy of a single GaAs interface fluctuation quantum dot (IFQD) was performed using a near-field scanning optical microscope (NSOM) with a spatial resolution of 40 nm. A difference in the emission profiles of an exciton and a biexciton was found for several IFQDs. By comparing with a numerical simulation based on the finite-difference time-domain method, this difference was attributed to the existence of a shallow potential dip in the IFQD. The NSOM wavefunction mapping for excitons and biexcitons as quasiparticles with different masses is a tool for investigating weak confinement potentials to detect local strain and disorder.

Original languageEnglish
Article number083116
JournalApplied Physics Letters
Issue number8
Publication statusPublished - 2008 Sep 15


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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